 Resolution |
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- The resolution varies depending on the number of teeth on the target.
- For example, when the module is 0.4, the diameter of the pulser that provides 256 (8 bits) pulse signals per rotation is approximately 100 mm.
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| <Relative position of gear teeth and elements> |
<Element circuit > |
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M (module) = (gear diameter)/number of teeth
Tooth-to-tooth pitch = M x 3.14 |
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- To achieve higher resolution, divide a cycle of a quasi-sine wave signal (interpolation division). Theoretically, it can be infinitely divided, but excessively fine division results in a division error when the waveform distortion rate is high. This limits the number of divisions.
- The maximum waveform distortion rate of the sensor is approximately 0.8%.
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| <Interpolation division > |
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(A) Sensor signal
- Amplify the minute sensor signal to the desired level as a pre-process.
- Use a filter to remove noise superimposed on analog signal.
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(B) Signal sampling
- Divide the signal equally in the time axis direction and use the amplitude of the analog signal (voltage value).
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(C) Signal quantization (Digitization)
- Divide the sampling signal equally in the voltage amplitude axis direction.
- Decrease the minimum unit of division to improve the resolution.
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- With an arithmetic circuit, multiply a cycle of the quasi-sine wave of the sensor signal.
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*The waveform distortion rate is reduced by decreasing the pulser's module. |
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